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About the Cover


Adult female Anopheles gambiae mosquitoes, the principal malaria vector in Africa. A sex-linked recessive mutation that changes the wild-type (right) eye color to white (left) has been mapped genetically on the X chromosome. See page 605 and the News story on page 546. [Photo: Jim Gathany, Centers for Disease Control Photoservices]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)